This short induction is followed by a rituximab (375mg/m2)maintenance/ Induction schedule:Rituximab+Bendamustine on Day 1, Bendamustine on Day 2, Rituximab on Day 8, Rituximab on Day 15, rituximab on day 22, Bendamustine on Day 29, Bendamustine on Day 30 Maintenance schedule: 12 infusions of rituximab, each 8 weeks